TsuBiKa

TsuBiKa is the most common name used to describe the relationship of Tsubasa Diana, Honda Hibiki and Makori Ririka.

The Trio
Hibiki, Diana and Ririka are well known for having very close friendship and sister-like relationship. Hibiki being 5 years older from Diana and Ririka she took the role of protective big sister first for Diana and later for Ririka as well.

Trivia

 * Hibiki, Diana and Ririka participated in the Unit Taikai as SisterWings along with Itano Tomoko.